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Lag Screws — Technical Drawing
Frequently Asked Questions
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What are lag screws used for?
Lag screws, also known as lag bolts, are heavy-duty fasteners used to join large pieces of lumber or to fasten wood to other materials. They are commonly used in construction, decking, framing, and structural applications where a strong, secure connection is required.
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What is the difference between a lag screw and a regular screw?
Lag screws are significantly larger and stronger than standard wood screws. They feature a hex or square head that requires a wrench or socket for installation, coarse threading designed to grip thick wood, and are intended for heavy-load structural connections rather than light-duty fastening tasks.
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Do lag screws require a pilot hole?
Yes, it is strongly recommended to pre-drill a pilot hole before installing a lag screw. This prevents the wood from splitting, reduces the torque required during installation, and ensures the screw is properly aligned. The pilot hole diameter should typically be about 75% of the screw's shank diameter.
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What materials are lag screws made from?
Lag screws are commonly manufactured from carbon steel, stainless steel, or galvanized steel. Stainless steel and hot-dip galvanized lag screws are preferred for outdoor or moisture-exposed applications due to their superior corrosion resistance and long-term durability.
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What sizes do lag screws come in?
Lag screws are available in a wide range of sizes. Diameters typically range from 1/4 inch to 1 inch (approximately 6mm to 25mm), and lengths can vary from 1 inch up to 6 inches or more. The appropriate size depends on the load requirements and the thickness of the materials being fastened.
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Can lag screws be used in outdoor or structural applications?
Yes, lag screws are well-suited for both outdoor and structural applications. For outdoor use, it is important to select corrosion-resistant options such as stainless steel or hot-dip galvanized lag screws to ensure longevity and maintain structural integrity when exposed to weather conditions.